Photovoltaic

9 posts / 0 new
Last post
Paul Gilman
PV Modules and Inverters not in Database

If you are using SAM's detailed photovoltaic model for a photovoltaic system that uses a module or inverter that is not included in SAM's libraries, you can use the CEC Performance Model with User Entered Specifications or Inverter Datasheet options on the Module and Inverter input pages, respectively. Those options allow you to enter data from a manufacturer's data sheet. Behind the scenes, SAM generates the coefficients it needs to model the equipment.

2 posts / 0 new
Last post
Jari
constraint fail in irradproc

Hi,

I try to run irradproc-module using irrad_mode = 2 when I receive the following error: "constraint fail: reason length_equal cannot find variable to test against, with 'length_equal=beam' for: diffuse"

Do I need to include beam irradiation data as an input when using irrad_mode=2? I only have global horizontal irradiation and diffuse available.

3 posts / 0 new
Last post
van.pham.nguyen
PV - Modeling Snow Loss Single Horizontal Axis Tracker

Hi,

Does the latest version of SAM (2017.9.5) model the snow loss for single horizontal axis tracking system?

If so does the model account for the changing tracking angle through the day and what sliding coefficient does it use?

I got the following error message when trying to model snow loss for a single horizontal axis tracking project.

2 posts / 0 new
Last post
Tiago M
Tiago M's picture
Configuration of the PV system depending on the load and shading

Hi,
Is it possible SAM give the configuration of the PV system without tracking (tilt and azimuth of the panel, the number of panels required, inverter, etc.) that best fits the load and the shading model we introduce to it as input?

Thanks
Tiago Marques

2 posts / 0 new
Last post
gregflynn
Inverters designed for oversized arrays

Is there a way to handle inverters that allow oversized arrays? Specifically, the new SMA PEAK3 and Solectria XGI-1500 inverters both allow DC/AC ratios of up to 1.5. Unfortunately, when I enter the parameters SAM computes the maximum DC input power from the maximum AC input power and the efficiency, but for these inverters they are two separate specifications.

2 posts / 0 new
Last post
gorman_will
SAM Python API AC vs. DC

Hello, I am using the SSC API to generate output for solar generation. I wanted to clarify whether the output I am pulling from SAM is in AC or DC terms.

The command I am using to get my final output is:

# Create SAM compliant object
dat = ssc.data_create()
ssc.data_set_table(dat, b'solar_resource_data', wfd)
ssc.data_free(wfd)

df['generation'] = np.array(ssc.data_get_array(dat, b'gen')).

So, is b'gen provided in AC or DC terms? I have set my ac:dc ratio to 1.1 and am simulating a bunch of 1 MW plants.

Thanks!

2 posts / 0 new
Last post
tdornbusch
Near Shading Losses

I am trying to replicate in SAM a solar PV system model that I have created in both PVSyst and PlantPredict. The models in these two systems are within a <1% error, but the SAM model is showing about a 4% error in comparison. The biggest discrepancy I see is that my SAM model shows .271% shading loss, while PVSyst shows 2.6% and PlantPredict shows 2.46%. There are also a couple of other smaller gaps.

2 posts / 0 new
Last post
henry_Du
What's the Installer margin and overhead

Hi, I'm a student at Duke University. I' m working on a solar PV project on campus. I have a question about Installer margin and overhead. I can't find the definition and reference about it. How can I assume it? I read your benchmark price report 2016 and 2017. Is it EPC Overhead or Developer Overhead?

2 posts / 0 new
Last post
johnkern17
Battery Storage Discharge Issue

Hi:

I am modeling Solar PV with Battery Storage using a manual dispatch for the Battery Storage. I've set the manual dispatch to discharge the battery during defined time periods during Weekdays. On weekends the battery does not discharge.

2 posts / 0 new
Last post
Jan Gershoj
ReOpt (Lite) functionality into SAM

Hi,

Any plans to get the functionality of ReOpt into SAM?
In other words, the possibility of directly simulating optimal PV Size based on uploaded load profile.

Thanks,

Theme by Danetsoft and Danang Probo Sayekti inspired by Maksimer